Improvement in machines for threading bolts and nuts



J. KILLEFER.

Machinefor Threading Bolts and Nuts.

No. 91,348. Patented June 15, 1869.

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Letters Patent No. 91,348, dated June 15, 1869.

IMPROVEMENT IN MACHINES FOR THREADING BOLTS AND NUTS.

The Schedule referred to in these Letters Patent and making part of the same,

To all whom it may concern:

Be it known that I,JOHN KILLEFEB, of West Richfield, in the county of Summit, and State of Ohio, have invented a new and useful Improvement in Bolt and Nut-Threadin g Machines; and I do hereby declare that the following is a' full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying dawings, forming part of this specification. Y

This invention relates to improvements in machinery for threading bolts and nuts, hating for its object to provide a more simple, cheap, and eflicient machine for the purpose than those now in use.

The invention consists in an improved arrangement of the bolt-threading dies and die-holders, to facilitate the changing of the dies for bolts of different sizes;

Also in the combination of the mechanism for autorriatically opening and closiug the jaws, with the boltholding mechanism, and the thread-cutting dies, arranged for operation, as will be hereinafter more fully described;

Also in the arrangement. of the several parts of the shipping-mechanism with the expanding-cone, and lever-die-holders; and v Lastly, in the combination of the nut-threading devices, which are operated from the reducing-gear of the srew-cutting mechanism.

In the accompanying drawings- Figure- 1 represents a plan view of my improved machine; i

Figure 2 represents across-section, taken on the Figure 3 represents a' plan of the die-holding chuck, showing the method of adjusting the dies; and

Figure 4 represents a side view of the top-holding spindle, with a part broken out, showing the means of disconnecting the chuck, for stopping it.

Similar letters of reference indicate corresponding parts,

A represents the vibrating die-holders, pivoted to the head, and operated to close upon the bolt by a sliding conical sleeve, in the usual manner.

B represents the dies for cutting the threads upon the bolt or rods, arranged in ways or grooves a, in the head of the holders A, and held therein by set-screws 11, taking into grooves, or holes, in the sides of the dies.

0 represents set-screws, screwing into the ends cf the dies, and bearing at their unscrewed ends against theend walls of the grooves, and provided with the jam-nuts d, by which they may be set, so that when in the holders, and the ends of the screws bearing against the end walls of the recess, the dies will be adjusted for the size of bolts required to be screwed. Any number of dies thus arranged and set for various sizes of bolts, may be employed, and one set readily substituted for another, to change for bolts of different sizes.

The clamping-jaws D, for holding the bolts or rods to be screwed, are pivoted, at F, to a holder or stock, E, arranged to slide to and fro on the parallel rods G, and in order to arrange the said jaws so that they 'both move equally away from the axial line of the dies.

When opened for the reception of the bolts to be screwed, the head or stock E is extended around the pawl toward their operating-ends, and is provided with the slots H on each side of the jaws and in the horizontal plane of the axis of the dies, and the-jaws are connected by the toggle-arms, in such a manner that the joint-pin K, uniting the two arms, extends from side to side of the stock E, and projects through the said slots H, thereby controlling the movement of the jaws, and compelling them to move equally each way from the said centre-line, as 'will be readily understood.

The clamping-jaws are moved, in either direction, to feed the bolt up to or withdraw it from the dies, by a hand-lever, h, pivoted to a lug, M, made adjustable on one of the rods G, the said lever being connected to the sliding stock by a link, N, and the jaws are closed upon the bolt by a hand-lever, 0, having an eccentric end bearing on the upper jaw, and connected to the lower one by a rod, P.

In order to arrange the jaws so that they will open automatically, when the bolt has been screwed to any predetermined length, and close in the same manner,

the lower rod G is arranged to slide in its bearings, and is secured to the sliding head to be moved by it, and it is provided with the adjustable lugs O and O, and the shipper-lever P is arranged to be struck by the said lugs, and moved in either direction thereby.

When the dies are acting on the bolt, and the latter is moving toward the dies, the lug 0 will strike the leyer P, and cause it to be withdrawn, the cone Q, which will allow the jaws to open, and cease their acting on the bolt, and when the head E is withdrawn, the lug 0 will force the lever 1? into the other direction, and throw the dies into the position for action again.

As an economical arrangement for utilizing the driving-mechanism of the bolt-threading machine herein described, for operating a nut-tapping device, I employ the shaft A of the back-gear, as a spindle for holding and operating the taps B; and to facilitate the gearing and ungearing of the taps with the continuously-moving parts, I make the end of the shaft A hollow, as represented at O, and provide a chuck, D, with a stock fitting into the said bored end, and cause the said chuck to clutch with the end of the shaft to be rotated by it when the stock is pressed sufficiently into the socket of the shaft to allow the two parts of the clutch to come together, as is clearly represented at fig. 4; and in order to throw the chuck out of connection, I provide a spring, E, in the said socket, be-

hind the stock of the chuck; and to move the chuck in the direction to clutch with the shaft or spindle A,

I employ the tail-screw F, arranged to take into the centre of the end of the tap, and provided with a hand-wheel for operating it.

G represents a guard, to prevent the chuck from being thrust out too far.

In order to stop the rotation of the chuck with the set-screw H, at the top, where it may be readily operated to withdraw and put in other taps, which is frequently necessary, to change the sizes, I provide a notch, I, in the front end of the chuck, into which the end of the guard G will fall, when the chuck is forced f out against it by the spring, and arrest the chuck in the right position.

Having thus described my invention,

I claim as new, and desire to secure by Letters Patentdie-holders, as herein shown and described.

4. The combination of the spring-clutch D, having the set-screw H, and recess I, the hollow shaft A and the guard G, with the mechanism for holding and advancing the nut, substantially as described for the purpose specified.

@ JOHN KILLEFEB.

f Witnesses:

GEORGE SANBORN, URI Ovmrr. 

